Navegando por Assunto "Porto de Santana - PA"

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Composição e variação nictimeral do ictioplâncton no estuário do rio Amazonas, Amapá, Brasil
(Universidade Federal do Pará, 2008-08-29) SILVA, Elke Micheline Anijar da; MELO, Nuno Filipe Alves Correia de; http://lattes.cnpq.br/4989238044542736
The Brazilian North Coast is one of the most productive regions of Brazil and the Amazon River as the main source of nutrients, which explains the great potential for primary production in the region. The main purpose of this study was to determine the composition and nycthemeral variation of ictioplâncton the estuary of the Port of Santana, state of Amapá, Brazil. The water sample was collected to measure subsurface following parameters: electrical conductivity, pH, salinity, turbidity, dissolved oxygen and temperature. The samples were taken, making two cycles of 24 hours in a season sets in the fourth moon rising (Quadrature) and a full moon (Syzygy). The collection of samples was done with a network of plankton, type Bongo with 0,60 m of opening of mouth, 1,50 m in length and aperture of 500 μm. To determine the volume of water was filtered into the network combined with a mechanical flowmeter, the sample was collected and packaged in pots with formalin fixed at 4%. transported to the Laboratory of Aquatic Ecology and Tropical Aquaculture - LECAT, Rural Federal University of the Amazon - where the UFRA ichthyoplankton was identified and quantified at the level of family. 2,776 larvae were quantified, these, 842 were sampled in the collection held in the tide of squaring (crescent moon) and 1,924 larvae in the Tide of sizígia (Full). The larvae of fish identified belonging to seven families (Engraulidae, Gobiidae, Sciaenidae, Tetraodontidae, Eleotridae, Pristigasteridae Clupeidae). The families Clupeidae and Gobiidae occurred only in the tide of squaring, while the families and Pristigasteridae Tetraodontidae occurred only in the tide of sizígia. During the trip by squaring (Crescent Moon) was the most abundant family Engraulidae followed by Sciaenidae and Pristigasteridae. At stations where larvae occurred, the density ranged from 137 larvae/100m³ to 15:30 until 2,859 larvae/100m³ to collect from 12:30 pm for the time of sampling time there is a pattern of distribution of the fish larvae influenced by the period of collection (night and day), with the highest values occur during the day. The high number of larvae registered revealed that area of the estuary of the Amazon river is used as an area of breeding and nursery. There are no significant differences in the composition of ichthyoplankton by changes in the lunar phase.